IEC 62053-21 Revised
IEC 62053-21:2003/AMD1:2016/COR1:2018
Corrigendum 1 - Amendment 1 - Electricity metering equipment (A.C.) - Particular requirements - Part 21: Static meters for active energy (classes 1 and 2)
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A more recent version of this publication exists:
IEC 62053-21:2020